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HOMESERVICE MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 123 (IGNITION/GLOW PLUG SYSTEM - 3.0L V6 AVK)IGNITION/GLOW PLUG SYSTEMIGNITION SYSTEM, CHECKINGCONTROL MODULE POWER SUPPLY, CHECKINGTEST SEQUENCE
1996 Audi A4 Base, Standard

Test sequence

1996 Audi A4 Base, StandardSECTION Test sequence
WARNING: This page is about a different car, the 2004 Audi A6, 2003 Audi A6, and 2002 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.
  • Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. See WIRING AND COMPONENT CHECK WITH TEST BOX VAG1598/31 .
  • Switch ignition on.
    NOTE:
    • The positive voltage supply to the engine control module is provided via terminal 3 (terminal 15) and terminal 62 (terminal 30).
    • The ground connection to the engine control module is provided via terminal 1 and terminal 2.
  • Connect multimeter as follows to measure voltage:
    CONTROL MODULE POWER SUPPLY CIRCUIT TEST - 1 OF 3

    Test box VAG1598/31 Socket Measure to
    1 Battery positive
    2 Battery positive
    62 Engine ground
    • Specified value: approx. battery voltage
  • Connect multimeter as follows to measure voltage:
    CONTROL MODULE POWER SUPPLY CIRCUIT TEST - 2 OF 3

    Test box VAG1598/31 Socket Measure to
    3 Engine ground
  • Switch ignition on.
    • Specified value: approx. battery voltage

If the specified values are not obtained:

  • Check wiring connections.
  • Connect multimeter as follows to measure voltage:
    CONTROL MODULE POWER SUPPLY CIRCUIT TEST - 3 OF 3

    Test box VAG1598/31 Socket Measure to
    121 (1) Engine ground
    (1) The Motronic Engine Control Module (ECM) power supply relay -J271- carries voltage on terminal 121 of engine control modules after switching off the ignition for up to 15minutes.
  • Switch ignition on.
    • Specified value: approx. battery voltage

If specified value is not obtained:

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.